Image pickup device for stabilizing optical aberrations

DETAILED DESCRIPTION The present invention aims at eliminating the drawbacks found in the above-mentioned prior art devices.
Accordingly, it is an object of the invention to provide an image pickup device which is capable of optically removing space frequency components corresponding to the pixel pitches of image pickup elements without deteriorating the optical performance of a taking lens.
In order to attain the above problem, according to the invention, there is provided an image pickup device which comprises an image pickup element including a plurality of photo-electric converter elements arranged at a constant pitch, a taking lens for allowing the image of an object light to be formed at a given position in front of the image pickup element, and an optical filter interposed between the object light image forming position and the image pickup element for receiving a spot image at the above image forming position by a divergent light of a given circle to guide the divergent light to the plurality of photo-electric converter elements.
According to the invention, the object light image is formed at a given image forming position by the taking lens, and the spot image at such image forming position is allowed to enter the optical filter as the divergent light of a given circle and is then guided through the optical filter to the plurality of photo-electric converter elements.
Due to the above, space frequency components corresponding to the pixel pitches of the image pickup element can be removed, and also due to the fact that the optical filter is disposed in the rear of the image forming position, there is eliminated the possibility that the optical aberrations become unstable.